The World Health Organisation (WHO) has said that 33 countries have reported 5,728 laboratory confirmed cases of swine flu with Cuba, Finland and Thailand the latest to join the list.
Mexico has reported 2,059 laboratory confirmed human cases of infection, including 56 deaths, while the United States has reported 3,009 cases, including three deaths.
In addition, Cuba, Finland and Thailand have now been added to the list of countries that have reported laboratory confirmed cases with no deaths.
Dr Sylvie Briand of WHO's Global Influenza Programme told reporters that several things about the virus are already known, including that the virus transmits easily and that most of the cases are mild and don't require treatment.
"However, we know also that there will be severe cases in people with underlying conditions, but also probably in young, healthy adults," she added.
"What we are trying to do at the moment is gather as much information as possible on the virus and to provide this information to countries so that they can assess their level of vulnerability and then put in place interventions that are needed to fight this disease," Briand stated.